scholarly journals Effect of Different Catalyst Supports on the Quality, Yield and Morphology of Carbon Nanotubes Produced from Waste Polypropylene Plastics

Catalysts ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 692
Author(s):  
Helen Uchenna Modekwe ◽  
Messai Adenew Mamo ◽  
Kapil Moothi ◽  
Michael Olawale Daramola
Keyword(s):  
Carbon Nanotubes ◽  
Heterogeneous Catalysts ◽  
Sol Gel ◽  
Oxide Supports ◽  
Nanoparticle Agglomeration ◽  
Yield And Quality ◽  
Nimo Catalysts ◽  
Waste Polypropylene

The role of the effect of the support on the reactivity of heterogeneous catalysts cannot be over-emphasized. Therefore, the study documented in this article investigated the effect of different metal oxide supports (MgO, CaO and TiO2) and mixed oxide supports (CaTiO3) on the performance of a bimetallic NiMo catalyst prepared via the sol–gel method during the catalytic growth of carbon nanotubes (CNTs) from waste polypropylene (PP). Waste PP was pyrolyzed at 700 °C in a single-stage chemical vapor deposition reactor and off-gas was utilized in-situ as a cheap carbon feedstock for the growth of CNTs under similar conditions for all the prepared NiMo catalysts (supported and unsupported). The structures of the prepared catalysts and deposited carbon were extensively characterized using X-ray diffraction (XRD), temperature-programmed reduction (TPR), transmission electron microscopy (TEM), thermogravimetric analysis (TGA), etc. The catalytic performance of NiMo supported and unsupported catalysts was evaluated in terms of the yield, purity, and morphology of synthesized CNTs. The results revealed that the stabilizing role of supports is fundamental in preventing nanoparticle agglomeration and aggregation, thereby resulting in improved yield and quality of CNTs. Supported NiMo catalysts produced better aligned graphitic and high-quality CNTs. The NiMo/CaTiO3 catalyst produced the highest carbon of 40.0%, while unsupported NiMo produced low-quality CNTs with the lowest carbon yield of 18.4%. Therefore, the type of catalyst support and overall stability of catalytic materials play significant roles in the yield and quality of CNTs produced from waste PP.

scholarly journals Synthesis of Carbon Nanotubes by Plasma-Enhanced Chemical Vapor Deposition Using Fe1−xMnxO Nanoparticles as Catalysts: How Does the Catalytic Activity of Graphitization Affect the Yields and Morphology?

2019 ◽  
Vol 5 (3) ◽  
pp. 46 ◽  
Author(s):  
Takashi Yanase ◽  
Takuya Miura ◽  
Tatsuya Shiratori ◽  
Mengting Weng ◽  
Taro Nagahama ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Catalytic Activity ◽  
Chemical Vapor Deposition ◽  
Vapor Deposition ◽  
Chemical Vapor ◽  
Thermal Cvd ◽  
Catalytic Function ◽  
Yield And Quality ◽  
Synthesis Of Carbon Nanotubes

The choice of a catalyst for carbon nanotube (CNT) growth is critical to controlling the morphology and chirality of the final product. Plasma-enhanced chemical vapor deposition (PECVD) can alleviate the requirements of the catalyst, i.e., they must be active for both the decomposition of the source gas and graphitization in the conventional thermal CVD. However, it is still not well understood how the catalytic activity of the graphitization affects the yield and quality of CNTs. In this paper, we systematically investigated the influence of the catalytic activity of graphitization by tuning the composition of Fe1−xMnxO (x = 0–1) nanoparticles as catalysts. As the Mn component increased, the number of CNTs decreased because Mn has no catalytic function of the graphitization. The quality of CNTs also affected by the inclusion of the Mn component. Our study may provide useful information to develop a new catalyst for CNT growth in PECVD.

scholarly journals Role of exogenous folic acid in alleviation of morphological and anatomical inhibition on salinity-induced stress in barley

2016 ◽  
Vol 11 (4) ◽  
pp. 246 ◽  
Author(s):  
Semra Kilic ◽  
Hatice Tuğba Aca
Keyword(s):  
Folic Acid ◽  
Seedling Growth ◽  
Growth Stages ◽  
Negative Effects ◽  
Salt Treatment ◽  
Yield And Quality ◽  
Agriculture Sustainability ◽  
Vigour Index

Soil salinity is a serious threat to agricultural ecological environment and agriculture sustainability. Ever increasing salinity negatively affects processes such as plant growth and development, ultimately causing diminished economic yield and quality of production, and it might cause a worldwide famine in the future. Thus, helping plants adapt to saline soils and increasing their yield and quality is a must. Our study focused on the enhancing role of exogenously applied folic acid (FA) in mitigation of toxicity caused by salt (NaCl). Barley seeds were pre-treated with 50 <span>µ</span>M FA for 24 h and then exposed to salt. Morphological and anatomical changes in seed germination and seedling growth stages were compared between different treatments of salt in laboratory conditions. Adverse effects of salt in both germination and seedling growth stages depended on the concentration of salt treatment (0.0, 0.25, 0.275, 0.30, 0.325 and 0.35 M). It was shown that the application of FA effectively alleviated the salt-induced inhibition, and reduced the negative effects of salt on germination (germination index and vigour index), seedling growth (radicle and coleoptile lengths, fresh weight) and leaf (stomata and epidermis number, stomatal index, stomata sizes of adaxial and abaxial surfaces) parameters. Moreover, FA elevated all examined parameters of barley also under non-stress conditions. Especially, germination and vigour indices were significantly higher than the control. Our results suggest that exogenous FA is involved in the resistance of barley to salt-stress.

Improving Yield and Quality of Processing Potato Crops Grown in the Argentinian Pampas: the Role of N, P and S and Their Impact on CO2 Emissions

2018 ◽  
Vol 61 (2) ◽  
pp. 147-168 ◽  
Author(s):  
D. O. Caldiz ◽  
P. G. Viani ◽  
C. M. Giletto ◽  
E. C. Zamuner ◽  
H. E. Echeverría
Keyword(s):  
Co2 Emissions ◽  
Yield And Quality ◽  
Potato Crops

The role of different fertilization strategies on the yield and quality of different flax varieties in the new lands

2020 ◽  
Vol 01 (03) ◽  
Author(s):  
Osama A. Nofal ◽  
Abdelhalim I Rezk ◽  
Mahmoud M. Abbas
Keyword(s):  
Yield And Quality

Response of green gram to potassium and zinc application

1984 ◽  
Vol 102 (1) ◽  
pp. 253-255
Author(s):  
B. Singh ◽  
B. S. Badhoria
Keyword(s):  
Green Gram ◽  
Cereal Crops ◽  
Zinc Treatment ◽  
Yield And Quality ◽  
Growth Attributes ◽  
Grain Yield And Quality ◽  
Positive Effect ◽  
Zinc Application

Green gram is one of the most important kharif pulse crops of India. It is of short duration, can fit well in crop rotation and, therefore, can be grown throughout the year. Information has been accumulating concerning the role of potassium and zinc in cereal crops but very little information is available regarding the nutrition of potassium and its interaction with zinc on the yield and quality of pulses. However, Malewar, Budhewar & Jadhav (1980) and Ghildiyal, Saini & Sirohi (1975) have reported significant positive effect of zinc treatment on growth attributes in green gram. The present investigations were, therefore, planned to study individual and interaction effects of potassium and zinc on growth, dry-matter and grain yield and quality of green gram.

scholarly journals The Role of Cultivation Systems in Quality Sugar Beet Production

2005 ◽  
pp. 134-138
Author(s):  
Kinga Diána Ungai ◽  
Zoltán Győri
Keyword(s):  
Sugar Beet ◽  
Production System ◽  
Plant Protection ◽  
Plant Production ◽  
High Yield ◽  
Yield And Quality ◽  
The Stability ◽  
Saccharose Content

Producing sugar beet, as it is a demanding field crop, has contributed to the raising standard of plant production. It has an outstanding place among the plants that are cultivated in the intensive plant production system. Rentability of sugar manufacture is determined by the stability of yield and the quality (saccharose content) of sugar beet. In this way, the fundamental interest both of the producers and the processing industry is high yield and quality, year by year. The yield and the quality of the sugar beet are mainly determined by the plant production system, so we studied the effect of fertilization, irrigation and plant protection.

Relationship between dietary protein, mohair fibre and carcass characteristics and fatty acid composition of angora goats

1991 ◽  
Vol 1991 ◽  
pp. 160-160
Author(s):  
H Galbraith ◽  
J J Baloyi ◽  
J R Scaife
Keyword(s):  
Dietary Protein ◽  
Crude Protein ◽  
Dry Matter ◽  
The United Kingdom ◽  
Yield And Quality ◽  
Fat Composition ◽  
Metabolisable Energy ◽  
Angora Goats

There is a developing interest in the use of fibre-producing goats in the United Kingdom. Information on nutritional requirements under UK conditions and for different genotypes of goats is limited. The aim of this study was to investigate further the role of dietary protein in determining the yield and quality of (a) mohair Fibre and (b) meat with emphasis on fat composition in Angora goats.Ten Texan cross male castrate Angora goats aged about 10 months and weighing 21.6 kg initially were used. They were individually penned and allocated to good quality diets containing (per kg dry matter (DM)) approximately 10 MJ metabolisable energy and either 110 (LP) or 178 (HP) g crude protein. The diets were restricted to intakes of 37 g/kg liveweight (LW) and the study lasted for 70 days. The goats were weighed weekly and food intake was recorded daily. Blood samples were collected pre-feeding by jugular venepuncture at approximately 0900 hrs on day 0, 35 and 70 and at 07.30,09.00,10.30,12.00 and 13.00 hrs on day 63.

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