scholarly journals Catalytic Pyrolysis of Biomass and Polymer Wastes

Catalysts ◽  
2018 ◽  
Vol 8 (12) ◽  
pp. 659 ◽  
Author(s):  
Laibao Zhang ◽  
Zhenghong Bao ◽  
Shunxiang Xia ◽  
Qiang Lu ◽  
Keisha Walters
Keyword(s):  
Catalytic Pyrolysis ◽  
Catalyst Deactivation ◽  
Value Added ◽  
Catalyst Design ◽  
Production Costs ◽  
Practical Utilization ◽  
High Oxygen Content ◽  
Polymer Waste ◽  
Caloric Value ◽  
Pyrolysis Of Biomass

Oil produced by the pyrolysis of biomass and co-pyrolysis of biomass with waste synthetic polymers has significant potential as a substitute for fossil fuels. However, the relatively poor properties found in pyrolysis oil—such as high oxygen content, low caloric value, and physicochemical instability—hampers its practical utilization as a commercial petroleum fuel replacement or additive. This review focuses on pyrolysis catalyst design, impact of using real waste feedstocks, catalyst deactivation and regeneration, and optimization of product distributions to support the production of high value-added products. Co-pyrolysis of two or more feedstock materials is shown to increase oil yield, caloric value, and aromatic hydrocarbon content. In addition, the co-pyrolysis of biomass and polymer waste can contribute to a reduction in production costs, expand waste disposal options, and reduce environmental impacts. Several promising options for catalytic pyrolysis to become industrially viable are also discussed.

scholarly journals Catalytic Pyrolysis of Aliphatic Carboxylic Acids into Symmetric Ketones over Ceria-Based Catalysts: Kinetics, Isotope Effect and Mechanism

Catalysts ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 179 ◽  
Author(s):  
Tetiana Kulik ◽  
Borys Palianytsia ◽  
Mats Larsson
Keyword(s):  
Carboxylic Acids ◽  
Isotope Effect ◽  
Catalytic Pyrolysis ◽  
Value Added ◽  
Linear Free Energy ◽  
Kinetic Isotope ◽  
Energy Relationships ◽  
Temperature Programmed ◽  
Aliphatic Carboxylic Acids ◽  
Pyrolysis Of Biomass

Ketonization is a promising way for upgrading bio-derived carboxylic acids from pyrolysis bio-oils, waste oils, and fats to produce high value-added chemicals and biofuels. Therefore, an understanding of its mechanism can help to carry out the catalytic pyrolysis of biomass more efficiently. Here we show that temperature-programmed desorption mass spectrometry (TPD-MS) together with linear free energy relationships (LFERs) can be used to identify catalytic pyrolysis mechanisms. We report the kinetics of the catalytic pyrolysis of deuterated acetic acid and a reaction series of linear and branched fatty acids into symmetric ketones on the surfaces of ceria-based oxides. A structure–reactivity correlation between Taft’s steric substituent constants Es* and activation energies of ketonization indicates that this reaction is the sterically controlled reaction. Surface D3-n-acetates transform into deuterated acetone isotopomers with different yield, rate, E≠, and deuterium kinetic isotope effect (DKIE). The obtained values of inverse DKIE together with the structure–reactivity correlation support a concerted mechanism over ceria-based catalysts. These results demonstrate that analysis of Taft’s correlations and using simple equation for estimation of DKIE from TPD-MS data are promising approaches for the study of catalytic pyrolysis mechanisms on a semi-quantitative level.

Production of Value-Added Aromatics from Wasted COVID-19 Mask via Catalytic Pyrolysis

2021 ◽  
pp. 117060
Author(s):  
Seul Bee Lee ◽  
Jechan Lee ◽  
Yiu Fai Tsang ◽  
Young-Min Kim ◽  
Jungho Jae ◽  
...  
Keyword(s):  
Catalytic Pyrolysis ◽  
Value Added

scholarly journals Influence of the Zeolite ZSM-5 on Catalytic Pyrolysis of Biomass via TG-FTIR

BioResources ◽  
2015 ◽  
Vol 10 (3) ◽  
Author(s):  
Ze Wang ◽  
Siwei Liu ◽  
Weigang Lin ◽  
Wenli Song
Keyword(s):  
Catalytic Pyrolysis ◽  
Pyrolysis Of Biomass

scholarly journals Quasi-graphitic carbon shell-induced Cu confinement promotes electrocatalytic CO2 reduction toward C2+ products

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Ji-Yong Kim ◽  
Deokgi Hong ◽  
Jae-Chan Lee ◽  
Hyoung Gyun Kim ◽  
Sungwoo Lee ◽  
...  
Keyword(s):  
High Efficiency ◽  
Co2 Reduction ◽  
Value Added ◽  
Material Design ◽  
Catalyst System ◽  
Critical Issue ◽  
Reduction Reaction ◽  
Catalyst Design ◽  
Design Strategies ◽  
Faradaic Efficiency

AbstractFor steady electroconversion to value-added chemical products with high efficiency, electrocatalyst reconstruction during electrochemical reactions is a critical issue in catalyst design strategies. Here, we report a reconstruction-immunized catalyst system in which Cu nanoparticles are protected by a quasi-graphitic C shell. This C shell epitaxially grew on Cu with quasi-graphitic bonding via a gas–solid reaction governed by the CO (g) - CO2 (g) - C (s) equilibrium. The quasi-graphitic C shell-coated Cu was stable during the CO2 reduction reaction and provided a platform for rational material design. C2+ product selectivity could be additionally improved by doping p-block elements. These elements modulated the electronic structure of the Cu surface and its binding properties, which can affect the intermediate binding and CO dimerization barrier. B-modified Cu attained a 68.1% Faradaic efficiency for C2H4 at −0.55 V (vs RHE) and a C2H4 cathodic power conversion efficiency of 44.0%. In the case of N-modified Cu, an improved C2+ selectivity of 82.3% at a partial current density of 329.2 mA/cm2 was acquired. Quasi-graphitic C shells, which enable surface stabilization and inner element doping, can realize stable CO2-to-C2H4 conversion over 180 h and allow practical application of electrocatalysts for renewable energy conversion.

A Fe-Ca/SiO2 catalyst for efficient production of light aromatics from catalytic pyrolysis of biomass

Fuel ◽  
2020 ◽  
Vol 279 ◽  
pp. 118500 ◽  
Author(s):  
Qiuxiang Lu ◽  
Shenfu Yuan ◽  
Chunxiang Liu ◽  
Tao Zhang ◽  
Xiaoguang Xie ◽  
...  
Keyword(s):  
Catalytic Pyrolysis ◽  
Efficient Production ◽  
Pyrolysis Of Biomass

Catalytic Pyrolysis of Biomass in a Fluidized Bed Reactor

2007 ◽  
Vol 85 (5) ◽  
pp. 473-480 ◽  
Author(s):  
A. Aho ◽  
N. Kumar ◽  
K. Eränen ◽  
T. Salmi ◽  
M. Hupa ◽  
...  
Keyword(s):  
Fluidized Bed ◽  
Catalytic Pyrolysis ◽  
Fluidized Bed Reactor ◽  
Pyrolysis Of Biomass

Catalytic Pyrolysis of Biomass over H+ZSM-5 under Hydrogen Pressure

2012 ◽  
Vol 26 (8) ◽  
pp. 5300-5306 ◽  
Author(s):  
Suchithra Thangalazhy-Gopakumar ◽  
Sushil Adhikari ◽  
Ram B. Gupta
Keyword(s):  
Hydrogen Pressure ◽  
Catalytic Pyrolysis ◽  
Pyrolysis Of Biomass

scholarly journals Techno-Economic Analysis of a Hyaluronic Acid Production Process Utilizing Streptococcal Fermentation

Processes ◽  
2021 ◽  
Vol 9 (2) ◽  
pp. 241
Author(s):  
Rafael G. Ferreira ◽  
Adriano R. Azzoni ◽  
Maria Helena Andrade Santana ◽  
Demetri Petrides
Keyword(s):  
Hyaluronic Acid ◽  
Economic Analysis ◽  
Lower Cost ◽  
Value Added ◽  
Production Costs ◽  
Selling Price ◽  
Baseline Scenario ◽  
Adhesive Properties ◽  
Fed Batch Culture ◽  
Economic Analyses

Hyaluronic acid (HA) is a polysaccharide of alternating d-glucuronic acid and N-acetyl-d-glucosamine residues present in the extracellular matrix of connective, epithelial, and nervous tissues. Due to its singular hydrating, rheological and adhesive properties, HA has found numerous cosmetic and medical applications. However, techno-economic analyses of high value-added bioproducts such as HA are scarce in the literature. Here, we present a techno-economic analysis of a process for producing HA using Streptococcus zooepidemicus, simulated in SuperPro Designer. In the baseline scenario, HA is produced by batch fermentation, reaching 2.5 g/L after 24 h. It is then centrifuged, diafiltered, treated with activated carbon and precipitated with isopropanol. The product is suitable for topical formulations and its production cost was estimated as 1115 $/kg. A similar scenario, based on fed-batch culture and assuming a titer of 5.0 g/L, led to a lower cost of 946 $/kg. Moreover, in two additional scenarios, 10% of the precipitated HA is diverted to the production of a highly pure and high-molecular weight HA, suitable for injectable applications. These scenarios resulted in higher capital and operating costs, but also in higher profits, because HA for injectable use has a higher selling price that more than compensates for its higher production costs.

NILAI TAMBAH PENGOLAHAN KANGKUNG HIDROPONIK MENJADI KANGKUNG RENDANG

2020 ◽  
Vol 2 (2) ◽  
pp. 95-106
Author(s):  
Indrawaty Sitepu ◽  
Nurmely Violeta Sitorus
Keyword(s):  
Raw Materials ◽  
Value Added ◽  
Data Retrieval ◽  
Rice Flour ◽  
Production Costs ◽  
Added Value ◽  
Water Spinach ◽  
A Value ◽  
Chicken Eggs

Kangkung hidroponik menjadi kangkung rendang merupakan kegiatan yang dapat meningkatkan nilai tambah, menghasilkan produk yang dapat dikonsumsi, serta menambah pendapatan dan keuntungan produsen.Tujuan penelitian untuk menguraikan apa saja tahapan pengolahan kangkung hidroponik menjadi kangukung rendang, menganalisis biaya produksi, penerimaan, dan pendapatan, menganalisis nilai tambah pengolahan kangkung hidroponik menjadi kangkung rendang, menganalisis apakah usaha pengolahan kangkung hidroponik menjadi kangkung rendang layak diusahakan. Penelitian ini dilakukan di Jalan Bromo lorong Amal Medan Denai Kota Medan. Penentuan daerah penelitian dilakukan secara purposive, Metode pengambilan sampel secara sensus yaitu usaha Syifa Hidroponik dengan pengambilan data ulangan selama 2,5 bualan sebanyak 10 kali ulangan. Hasil penelitian: 1) Tahapan  pengolahan kangkung hidroponik menjadi kangkung rendang yaitu:  Penyediaan bahan baku kangkung hidroponik, kangkung dihaluskan, pengadonan kangkung, telur ayam, tepung beras dan garam, kangkung dikukus, kangkung didinginkan, dipotong-potong, digoreng, pemasakan bumbu rendang, pencampuran kangkung yang digoreng dengan bumbu rendang dan pemasaran. Total biaya pengolahan kangkung hidroponik menjadi kangkung rendang untuk sekali produksi sebesar Rp 545.291,83, penerimaan sebesar Rp 1.500.000,00, per sekali produksi dan pendapatan sebesar Rp 954.708,17 per sekali produksi. Nilai tambah yang dihasilkan dari pengolahan kangkung hidroponik menjadi kangkung rendang tergolong tinggi dengan rasio nilai tambah 75,31% > 50%.Usaha pengolahan kangkung hidroponik menjadi kangkung rendang layak untuk diusahakan dengan nilai R/C rasio 2,75 > 1.  Abstract  Hydroponic water spinach into rendang water spinach is an activity that can increase added value, produce edible products, as well as increase producer income and profits. The purpose of the research is to describe what are the stages of processing hydroponic water spinach into rendang kangukung, analyze production costs, revenue, and income, analyze added value of processing hydroponic water spinach into rendang water spinach, analyzing whether the business of processing hydroponic water spinach into rendang water spinach is worth the effort. This research was conducted in Jalan Bromo Amal Medan Denai alley Medan City. Determination of the study area was done purposively, census sampling method that is Syifa Hydroponic business with retrieval data retrieval for 2.5 boasting as many as 10 replications. The results of the study: 1) The stages of processing hydroponic water spinach into rendang water spinach, namely: Provision of raw materials for hydroponic water spinach, crushed water spinach, stirring water spinach, chicken eggs, rice flour and salt, steamed water spinach, water spinach water spinach, cut into pieces, fried, fried spicy water spinach, cooking water spinach kale, chicken egg, rice flour and salt, steamed water spinach, water spinach kangkung cooled, cut, fried, cooking spices, rendang, mixing fried kale with spicy rendang and marketing. The total cost of processing hydroponic water spinach into rendang water spinach for one production is Rp. 545,291.83, revenue is Rp. 1,500,000.00, per production and income is Rp. 954,708.17 per production. The added value generated from the processing of hydroponic water spinach into rendang water spinach is classified as high with a value added ratio of 75.31%> 50%. The business of processing hydroponic water spinach into rendang water spinach is feasible to be cultivated with an R / C ratio of 2.75> 1.  

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