scholarly journals The Effect of Preparation Method of Ni-Supported SiO2 Catalysts for Carbon Dioxide Reforming of Methane

Catalysts ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 1221
Author(s):  
Hua-Ping Ren ◽  
Si-Yi Ding ◽  
Qiang Ma ◽  
Wen-Qi Song ◽  
Yu-Zhen Zhao ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Particle Size ◽  
Active Sites ◽  
High Performance ◽  
Preparation Method ◽  
Complexing Agent ◽  
Preparation Process ◽  
Carbon Dioxide Reforming ◽  
Preparation Methods ◽  
Synthetic Strategy

Reforming methane to produce syngas is a subject that generates considerable interest. The process requires catalysts that possess high-performance active sites to activate stable C–H bonds. Herein, we report a facile synthetic strategy to prepare Ni-based catalysts by complexation–impregnation (Ni-G/SiO2-C) and precipitation–impregnation (Ni-G/SiO2-P) methods using glycine as a complexing agent. The particle size of Ni in both types of catalysts is decreased by adding glycine in the preparation process. Nevertheless, the preparation methods and amount of glycine play a significant role in the particle size and distribution of Ni over the Ni-based catalysts. The smaller particle size and narrower distribution of Ni were obtained in the Ni-G/SiO2-P catalyst. The catalysts were comparatively tested for carbon-dioxide reforming of methane (CDR). Ni-G/SiO2-P showed better CDR performance than Ni-G/SiO2-C and Ni/SiO2 and increased stability because of the smaller particle size and narrower distribution of Ni. Moreover, a high-performance Ni-based catalyst was prepared by optimizing the amount of glycine added. An unobservable deactivation was obtained over Ni-G-2/SiO2-P and Ni-G-3/SiO2-P for CDR during TOS = 20 h. Thus, a new promising method is described for the preparation of Ni-based catalysts for CDR.

scholarly journals Carbon Dioxide Reforming of Methane over Ni Supported SiO2: Influence of the Preparation Method on the Resulting Structural Properties and Catalytic Activity

Catalysts ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 795 ◽  
Author(s):  
Hua-Ping Ren ◽  
Shao-Peng Tian ◽  
Si-Yi Ding ◽  
Gui-Qiu Huang ◽  
Min Zhu ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Particle Size ◽  
Catalytic Activity ◽  
Citric Acid ◽  
Preparation Method ◽  
Complexing Agents ◽  
Impregnation Method ◽  
Carbon Dioxide Reforming ◽  
Highly Active ◽  
Before And After

Ni-C/SiO2 and Ni-G/SiO2 catalysts were prepared by a complexed-impregnation method using citric acid and glycine as complexing agents, respectively. Ni/SiO2 was also prepared by the conventional incipient impregnation method. All the catalysts were comparatively tested for carbon dioxide reforming of methane (CDR) at P = 1.0 atm, T = 750 °C, CO2/CH4 = 1.0, and GHSV = 60,000 mL·g−1·h−1. The results showed that Ni-C/SiO2 and Ni-G/SiO2 exhibited better CDR performance, especially regarding stability, than Ni/SiO2. The conversions of CH4 and CO2 were kept constant above 82% and 87% after 20 h of reaction over Ni-C/SiO2 and Ni-G/SiO2 while they were decreased from 81% and 88% to 56% and 59%, respectively, over the Ni/SiO2. The characterization results of the catalysts before and after the reaction showed that the particle size and the distribution of Ni, as well as the interactions between Ni and the support were significantly influenced by the preparation method. As a result, an excellent resistance to the coking deposition and the anti-sintering of Ni was obtained over the Ni-C/SiO2 and Ni-G/SiO2, leading to a highly active and stable CDR performance.

A High-Performance Ni/SiO2 Prepared by the Complexed-Impregnation Method with Citric Acid for Carbon Dioxide Reforming of Methane

2018 ◽  
Vol 57 (48) ◽  
pp. 16257-16263 ◽  
Author(s):  
Hua-Ping Ren ◽  
Qing-Qing Hao ◽  
Si-Yi Ding ◽  
Yu-Zhen Zhao ◽  
Min Zhu ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Citric Acid ◽  
High Performance ◽  
Impregnation Method ◽  
Carbon Dioxide Reforming

Recent Progresses on Some Coke Resistant Ni-Based Catalysts for Carbon Dioxide Reforming of Methane

2013 ◽  
Vol 650 ◽  
pp. 85-91 ◽  
Author(s):  
Hong Tao Jiang ◽  
Wei Hua ◽  
Hui Quan Li ◽  
Yong Chuan Dai
Keyword(s):  
Carbon Dioxide ◽  
Solid Solutions ◽  
Low Cost ◽  
Coke Formation ◽  
Ni Catalyst ◽  
Carbon Dioxide Reforming ◽  
Ni Catalysts ◽  
Preparation Methods ◽  
Supporting Materials ◽  
Perovskite Type

Carbon dioxide reforming of methane (CDR) can convert two greenhouse gases, methane can carbon dioxide, into useful syngas. Nickel-based catalysts have been extensively investigated due to their high activity and low cost. However, coke formation over Ni catalyst is serious and leads to rapid deactivation of the catalyst. Coke resistant Ni catalyst for CDR reaction is desired. In this paper, recent progresses in the design and preparation of coke resistant Ni catalysts supported on solid solutions, zeolite, perovskites and perovskite type oxides, hexaaluminates or substituted hexaaluminates, pyrochlore, montmorillonites, and hydrotalcites for CDR were summarized. The progresses in the use of promoters, in the effect of supporting materials and in the preparation methods have been discussed. The future development of coke resistant Ni catalysts for these processes is briefly addressed.

Preparation of the Scales Material Adsorption EGCG

2014 ◽  
Vol 960-961 ◽  
pp. 270-273
Author(s):  
Zhou Wei Duan ◽  
Zhi Hao Dou ◽  
Hui Xie ◽  
Ai He ◽  
Zhu Ning Wan
Keyword(s):  
Particle Size ◽  
Adsorption Capacity ◽  
Raw Material ◽  
Preparation Process ◽  
Liquid Ratio ◽  
Preparation Temperature ◽  
Preparation Methods ◽  
Tilapia Scale ◽  
Material Preparation

Tilapia scale was used as the raw material to explore the preparation methods of EGCG adsorption material. Based on the results, the most reasonable interpretation of the data indicates that the EGCG adsorption material preparation process was as follows, particle size 0.30-0.45 mm , preparation temperature 110°C,pH 7 , solid to liquid ratio (g/mL) 1:6, time 20 min . Under this condition, the adsorption capacity of EGCG was 23.53mg/g.

Nanoparticles-in-concavities as efficient nanocatalysts for carbon dioxide reforming of methane to hydrogen and syngas

2016 ◽  
Vol 6 (12) ◽  
pp. 4565-4576 ◽  
Author(s):  
Jie Deng ◽  
Wei Chu ◽  
Bo Wang ◽  
Zhenxin Xu ◽  
Wen Yang ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Active Sites ◽  
Dry Reforming ◽  
Carbon Dioxide Reforming ◽  
Methane Dry Reforming ◽  
Nanoparticle Catalysts ◽  
Catalytic Performances

The ceria concavity-loaded Ni nanoparticle catalysts can lead to more active sites and promote CO2 dissociative activation and CO desorption, thus enhancing significantly the catalytic performances for methane dry reforming with CO2.

scholarly journals Potensi Ekstrak Oligosakarida Ubi Jalar Sebagai Prebiotik Bakteri Probiotik Akuakultur (The Potential of Sweet Potato Oligosaccharide Extract as Aquaculture Probiotic Bacteria Prebiotic)

1970 ◽  
Vol 3 (1) ◽  
pp. 16-20
Author(s):  
Wida Lesmanawati ◽  
Widanarni Widanarni ◽  
Sukenda Sukenda ◽  
Wahyu Purbiantoro
Keyword(s):  
Sweet Potato ◽  
High Performance ◽  
Ipomoea Batatas ◽  
Preparation Method ◽  
Sea Water ◽  
Probiotic Bacteria ◽  
Potato Flour ◽  
Preparation Methods ◽  
Growth Of Bacteria

Sweet potato contains non digestible oligosaccharides that functions as prebiotics. The processing will affect the chemical composition of sweet potato. This study aimed to find the best preparation method of sweet potato (Ipomoea batatas) that can produce the highest oligosaccharide extract and test the prebiotic potential of the extract to support the growth of bacteria SKT-b which has been shown to act as a probiotic for shrimp. Trial I: test the preparation method of sweet potato to obtain the best oligosaccharides extract. The treatment consisted of three different preparation methods, raw potato flour, raw potato flour steamed, and steamed potato flour. Oligosaccharides from potato flour of each preparation method was then extracted and analyzed using High Performance Liquid Chromatography. Potato oligosaccharides extract from best preparation method, was dried in freeze dryer and used for later experiments. Trial II: test the potato oligosaccharides extract as prebiotic in supporting the growth of probiotic bacteria SKT-b (in vitro). This experiment was conducted to determine the combinations of prebiotic dose with inoculants concentrations that result the best growth of bacteria SKT-b. Liquid culture bacteria SKT-b concentrations of 107, 108, 109, and 1010 cfu ml-1 were cultured in sterile sea water mixed with prebiotics concentrations of 0, 1, 2 and 3% v/v. The extract of steamed potato flour contains the highest oligosaccharides, and may act as prebiotics to support the growth of probiotic bacteria SKT-b. Prebiotics 3% and probiotics SKT-b 1010 cfu ml-1 was the best sinbiotic combination, which showed the highest growth of probiotic bacteria.Keywords: oligosaccharides, probiotics SKT-b, sinbiotic, sweet potato

Carbon dioxide reforming of methane over MgO-promoted Ni/SiO2 catalysts with tunable Ni particle size

2020 ◽  
Vol 356 ◽  
pp. 589-596 ◽  
Author(s):  
Jie-ying Jing ◽  
Ze-hua Wei ◽  
Yu-bin Zhang ◽  
Hong-cun Bai ◽  
Wen-ying Li
Keyword(s):  
Carbon Dioxide ◽  
Particle Size ◽  
Carbon Dioxide Reforming

The Effect of MgO Precoating on the Perfomance of Ni/MgO-Al2O3 Catalysts for Carbon Dioxide Reforming of Methane

2014 ◽  
Vol 997 ◽  
pp. 272-278 ◽  
Author(s):  
Li Qiong Huang ◽  
Zheng Hui Zhang ◽  
Zhang Long Guo
Keyword(s):  
Carbon Dioxide ◽  
Surface Area ◽  
Active Sites ◽  
Impregnation Method ◽  
X Ray Diffraction ◽  
Carbon Dioxide Reforming ◽  
Temperature Programmed ◽  
Ni Species ◽  
Adsorption Desorption ◽  
Nickel Species

Ni catalysts supported on γ?-Al2O3 supports modified by different MgO precoating weight were prepared by impregnation method. The surface area, pore diameter and Ni crystallite size were investigated by N2 adsorption/desorption (BET) and X-ray diffraction (XRD) methods. The reducing temperature and quantity information of reducible nickel species were obtained by H2-TPR experiments. The CO2 adsorption/desorption abilities of catalysts were investigated and the activity of catalysts were also measured. The coke resistance performance of catalysts for carbon dioxide reforming of methane (CDRM) was studied by CO2 temperature programmed surface reaction (CO2-TPSR). H2-TPR results revealed that there were three kinds of Ni species on the supports. Appropriate modification amount of MgO could increase the surface nickel active sites which could be easily reduced and prevented the formation of NiAl2O4 spinel species. CO2-TPD indicated that the addition of MgO increased the amount of CO2 adsorption at lower temperatures. N2 adsorption/desorption results disclosed that the excessive modification of MgO would decrease the surface area and pore size of the samples. The reforming reaction results showed that the activity was elevated from 58.62% to 65.95% over the Ni/MgO-Al2O3 when the Mg/Al ratio was 0.05 (wt.) and there was less coke evidenced by the CO2-TPSR results comparing to the Ni/γ?-Al2O3 catalyst.

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