Development of Nanoalloy Catalysts for Realization of Carbon-Neutral Energy Cycles

2014 ◽  
Vol 783-786 ◽  
pp. 2046-2050 ◽  
Author(s):  
Miho Yamauchi ◽  
Minako Heima ◽  
Masaaki Sadakiyo
Keyword(s):  
Oxalic Acid ◽  
Partial Oxidation ◽  
Liquid Fuels ◽  
Circulation System ◽  
Precious Metal Catalysts ◽  
Present Generation ◽  
Oxidation Of Alcohols ◽  
Alkaline Conditions ◽  
New Type ◽  
Carbon Neutral

Increase of CO2 concentration in the atmosphere is one of reasons for the global warming. Development of energy circulation systems, which do not emit CO2 in the atmosphere, is an emergent issue for present-generation scientists [1]. As an answer, we have proposed a new type of energy circulation system, namely, carbon-neutral energy (CN) cycle. With a practical application in mind, three limitations are imposed on the CN cycle; (1) no CO2 emissions, (2) utilization of liquid fuels and (3) minimizing the use of precious metal catalysts. In anticipation of a practical use in the near future, an alkaline fuel cell will be adapted for the CN cycle where non-platinum catalysts can work. For our purpose, electric power will be generated by partial oxidation of alcohols to carboxylic acids.[2] In view of ease in handling, fuels having a high boiling point (b.p.) are favorable for the CN cycles. To this end, glycol (EG) of which b.p. is 470 K an ideal candidate as a fuel. In this case, an oxidized product of EG can be oxalic acid. Compared to the energy obtained by the complete oxidation of EG into CO2, we can derive ca. 80 % of energy even in the partial oxidation of EG to oxalic acid, implying that the EG/oxalic cycle possibly works as an energy cycle. We herein show an example of selective EG oxidation catalysts working in alkaline conditions.

Enhanced Methane Conversion using Ni-doped Calcium Ferrite Oxygen Carriers in Chemical Looping Partial Oxidation Systems with CO2 Utilization

2021 ◽  
Author(s):  
Vedant Shah ◽  
Zhuo Cheng ◽  
Pinak Mohapatra ◽  
Liang-Shih Fan
Keyword(s):  
Partial Oxidation ◽  
Methane Conversion ◽  
Liquid Fuels ◽  
Calcium Ferrite ◽  
Chemical Looping ◽  
Oxygen Carriers ◽  
Co2 Utilization ◽  
High Quality ◽  
Novel Technology

Chemical looping partial oxidation (CLPO) is a novel technology for converting methane into high quality syngas that can be further converted into liquid fuels. In the present work, Ni-doped Ca2Fe2O5...

Integration of the aprotic CO2 reduction to oxalate at a Pb catalyst into a GDE flow cell configuration

2021 ◽  
Author(s):  
Maximilian König ◽  
Shih-Hsuan Lin ◽  
Jan Vaes ◽  
Deepak Pant ◽  
Elias Klemm
Keyword(s):  
Oxalic Acid ◽  
Co2 Reduction ◽  
Flow Cell ◽  
Aprotic Solvents ◽  
Cell Configuration ◽  
Carbon Neutral

The electrochemical CO2 reduction to oxalic acid in aprotic solvents could be a potential pathway to produce carbon-neutral oxalic acid. One of the challenges in the aprotic CO2 reduction are...

Biocatalysis and biomass conversion: enabling a circular economy

2020 ◽  
Vol 378 (2176) ◽  
pp. 20190274 ◽  
Author(s):  
Roger A. Sheldon
Keyword(s):  
Circular Economy ◽  
Biomass Conversion ◽  
Raw Material ◽  
Liquid Fuels ◽  
Waste Biomass ◽  
Renewable Biomass ◽  
Precious Metal Catalysts ◽  
Mitigate Climate Change ◽  
Forestry Residues ◽  
The Right

This paper is based on a lecture presented to the Royal Society in London on 24 June 2019. Two of the grand societal and technological challenges of the twenty-first century are the ‘greening' of chemicals manufacture and the ongoing transition to a sustainable, carbon neutral economy based on renewable biomass as the raw material, a so-called bio-based economy. These challenges are motivated by the need to eliminate environmental degradation and mitigate climate change. In a bio-based economy, ideally waste biomass, particularly agricultural and forestry residues and food supply chain waste, are converted to liquid fuels, commodity chemicals and biopolymers using clean, catalytic processes. Biocatalysis has the right credentials to achieve this goal. Enzymes are biocompatible, biodegradable and essentially non-hazardous. Additionally, they are derived from inexpensive renewable resources which are readily available and not subject to the large price fluctuations which undermine the long-term commercial viability of scarce precious metal catalysts. Thanks to spectacular advances in molecular biology the landscape of biocatalysis has dramatically changed in the last two decades. Developments in (meta)genomics in combination with ‘big data’ analysis have revolutionized new enzyme discovery and developments in protein engineering by directed evolution have enabled dramatic improvements in their performance. These developments have their confluence in the bio-based circular economy. This article is part of a discussion meeting issue ‘Science to enable the circular economy'.

Catalytic Partial Oxidation of Alcohols in the Vapor Phase.IV

1932 ◽  
Vol 24 (8) ◽  
pp. 924-926 ◽  
Author(s):  
W. Lawrence Faith ◽  
P. E. Peters ◽  
D. B. Keyes
Keyword(s):  
Partial Oxidation ◽  
Catalytic Partial Oxidation ◽  
Oxidation Of Alcohols

Analysis and Application of Oxalic Acid Modified Sodium Silicate Binder

2012 ◽  
Vol 573-574 ◽  
pp. 31-34
Author(s):  
Li Ge Wang ◽  
Fan Zhang ◽  
Yang Zhang ◽  
Long Zhou ◽  
En Ze Wang
Keyword(s):  
Compressive Strength ◽  
Oxalic Acid ◽  
Chemical Modification ◽  
Functional Groups ◽  
Sodium Silicate ◽  
Bonding Strength ◽  
Colloidal Particle ◽  
Particle Surface ◽  
Growing Up ◽  
New Type

A new type of pellet binder was prepared with oxalic acid as sodium silicate chemical modification agent in this paper, the compressive strength of which improved obviously. It improved from 0.6 KN/a to 2.4 KN/a, when the amount of oxalic acid is 8%. Meanwhile, carboxyl introduced at 390°C started carbonization decomposition, and pelletizing properties wouldn't be affected without new pellet impurity. The analysis shows that adding oxalic acid introduces carboxyl only in the binder, but doesn't generate new functional groups; Polymer layer formed by carboxyl adsorption on sodium silicate gel particle surface limits colloidal particle growing up, and plays roles of refining colloidal particle and improving the bonding strength.

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