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BET theory

About: BET theory is a research topic. Over the lifetime, 9046 publications have been published within this topic receiving 286142 citations.


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Journal ArticleDOI
TL;DR: In this paper, a hollow carbon sphere (HCS) with open micropores and nanochannels was constructed by combined methods of hydrothermal and intermittent microwave heating (IMH) for the first time.

110 citations

Journal ArticleDOI
TL;DR: In this article, a series of titania modified mesoporous silicates with variable Si/Ti ratios were prepared using titanium tetrabutoxide by impregnation method using XRD, TEM, FT-IR, low temperature N 2 sorption, and UV-Vis diffused reflectance spectroscopy.

110 citations

Journal ArticleDOI
TL;DR: In this paper, the effect of crystal size on catalytic activity and stability of nano-sized ZSM-5 zeolites was investigated for light olefins synthesis from acetone.
Abstract: Production of light olefins such as ethylene, propylene and isobutylene from acetone was examined over ZSM-5 zeolites. These light olefins are produced from acetone over the acid sites of the zeolite via a series of consecutive reactions where olefins such as ethylene and propylene are obtained by cracking of isobutylene produced from aldol condensation products of acetone. Macro- and nano-sized ZSM-5 zeolites were prepared by conventional hydrothermal and emulsion methods, respectively, and the ZSM-5 zeolites with nearly the same acidity and BET surface area were obtained regardless of the crystal sizes. From SEM observations, the crystal sizes of the zeolites were approximately 2000 nm and 30–40 nm. These zeolites with different crystal sizes were applied to light olefins synthesis from acetone, and the effect of crystal size on catalytic activity and stability was investigated. As compared with the macro-seized zeolite, the nano-sized zeolite exhibited a high activity over a long lifetime. However, because the nano-sized zeolite possesses a large external surface area, undesirable reactions to form aromatics from the produced light olefins occurred on the acid sites located near the external surface. To inhibit aromatics formation, selective deactivation of the acid sites located near the outer surface of the zeolite was achieved via the catalytic cracking of silane (CCS) method using diphenyl silane (DP-silane). The CCS method was effective in deactivating the acid sites located near the external surface of the ZSM-5 zeolite. Moreover, the nano-size zeolite after the CCS treatment using DP-silane exhibited high olefins and low aromatics yields under high acetone conversion conditions.

110 citations

Journal ArticleDOI
TL;DR: In this article, an industrial waste abundantly available in Malaysia was utilized as a feedstock for preparation of activated carbon (EFBAC) via KOH chemical activation using a microwave device operating at 2.45 GHz.

110 citations

Journal ArticleDOI
Kai Yang1, Qiuming Gao1, Yanli Tan1, Weiqian Tian1, Weiwei Qian1, Lihua Zhu1, Chunxiao Yang1 
TL;DR: Biomass-derived porous carbon BPC-700, incorporating micropores and small mesopores, was prepared through pyrolysis of banana peel followed by activation with KOH, indicating a good sulfur utilization rate and an outstanding cycling stability.
Abstract: Biomass-derived porous carbon BPC-700, incorporating micropores and small mesopores, was prepared through pyrolysis of banana peel followed by activation with KOH. A high specific BET surface area (2741 m2 g-1 ), large specific pore volume (1.23 cm3 g-1 ), and well-controlled pore size distribution (0.6-5.0 nm) were obtained and up to 65 wt % sulfur content could be loaded into the pores of the BPC-700 sample. When the resultant C/S composite, BPC-700-S65, was used as the cathode of a Li-S battery, a large initial discharge capacity (ca. 1200 mAh g-1 ) was obtained, indicating a good sulfur utilization rate. An excellent discharge capacity (590 mAh g-1 ) was also achieved for BPC-700-S65 at the high current rate of 4 C (12.72 mA cm-2 ), showing its extremely high rate capability. A reversible capacity of about 570 mAh g-1 was achieved for BPC-700-S65 after 500 cycles at 1 C (3.18 mA cm-2 ), indicating an outstanding cycling stability.

110 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023166
2022356
2021525
2020551
2019533
2018531