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Dry reforming of methane over Ni/SBA-15 catalysts prepared by homogeneous precipitation method
Qiulin Zhang,Jing Wang,Ping Ning,Tengfei Zhang,Mingzhi Wang,Kaixian Long,Jianhong Huang 한국화학공학회 2017 Korean Journal of Chemical Engineering Vol.34 No.11
Ni/SBA-15 catalyst was prepared by homogeneous precipitation method (Ni-HP) and used for dry reforming of methane (DRM). The related characterization results indicated that the Ni particles were highly dispersed with a size range of 2-5 nm. Compared with Ni/SBA-15 catalyst prepared by impregnation (Ni-IM), the reduction temperature of Ni-HP obtained from H2-TPR was greatly improved, suggesting the stronger metal-support interaction. After reacting at 700 oC for 100 h, the CH4 conversion of DRM over Ni-HP catalyst slightly decreased from 74.5% to 73.8%. While, for the Ni-IM catalyst, the CH4 conversion dropped from 61.7% to 37.3%. Furthermore, the average particle size of Ni-HP was 3.7 nm and 4.7 nm before and after the long-time stability test, respectively, ascribed to the good antisintering property. Although a certain amount of coke was produced, mainly with disorder filamentous carbon of basegrowth, the Ni/SBA-15 prepared by homogeneous precipitation exhibited excellent catalytic activity and stability.
An Improved Algorithm of Rough K-Means Clustering Based on Variable Weighted Distance Measure
Tengfei Zhang,Long Chen,Fumin Ma 보안공학연구지원센터 2014 International Journal of Database Theory and Appli Vol.7 No.6
Rough K-means algorithm has shown that it can provides a reasonable set of lower and upper bounds for a given dataset. With the conceptions of the lower and upper approximate sets, rough k-means clustering and its emerging derivatives become valid algorithms in vague information clustering. However, the most available algorithms ignore the difference of the distances between data objects and cluster centers when computing new mean for each cluster. To solve this issue, an improved algorithm of rough k-means clustering based on variable weighted distance measure is presented in this article. Comparative experimental results of real world data from UCI demonstrate the validity of the proposed algorithm.
He Guisong,Long Tengfei,Chen Guofeng 대한독성 유전단백체 학회 2022 Molecular & cellular toxicology Vol.18 No.4
Background Osteoporosis (OP) is one of the most common bone diseases, resulting in increased mortality, persistent disability, and reduced quality of life. It is characterized by bone loss and low bone quality. Objective The objective of this study was to detect possible effects of HOXA11-AS on the progression of Osteoporosis (OP) and investigate the potential downstream targets. Results We found HOXA11-AS was low expression in BMSCs of OVX-induced rats. HOXA11-AS promoted osteoblastic differentiation and the expression of osteoblastic genes in BMSCs. Mechanically, we found HOXA11-AS negatively regulated the expression of miR-208a-3p, and miR-208a-3p could further target ETS proto-oncogene 1 (ETS1) in BMSCs. We further demonstrated HOXA11-AS promoted osteogenic differentiation of BMSCs through ETS1. Conclusion We therefore thought HOXA11-AS could serve as a promising target for the treatment of OP.
Carbon dioxide reforming of methane over MgO promoted Ni/CNT catalyst
Dehua Zhang,Guangcheng Wei,Yiru Wang,Jing Wang,Ping Ning,Qiulin Zhang,Mingzhi Wang,Tengfei Zhang,Kaixian Long 한국화학공학회 2018 Korean Journal of Chemical Engineering Vol.35 No.10
Carbon dioxide reforming of methane to syngas was investigated over a series of MgO promoted Ni/CNT catalysts. MgO played a critical role in improving the catalytic performance of Ni/CNT. The results showed that the addition of MgO strengthened the interaction of Ni and interior surface of CNT. Highly dispersed nickel particles with small size (less than 4.5nm) were also observed in MgO modified CNT. Otherwise, the NiO nanoparticles were facilely reduced over the catalyst prepared with a narrow size of CNT, as shown in H2-TPR. The reaction tests demonstrated that the Ni-based catalyst with an addition of MgO and narrow size of CNT exhibited better catalytic activity. Furthermore, the lifetime of Ni-based catalyst was prolonged effectively after adding MgO, attributed to the stabilization and dispersion of Ni particles and the effective restraint on the gasification of CNT.