Removal of H2S from crude oil via stripping followed by adsorption using ZnO/MCM-41 and optimization of parameters

Hazrati, Nastaran; Abdouss, Majid; Vahid, Amir; Beigi, Ali Akbar Miran; Mohammadalizadeh, Ali

doi:10.1007/s13762-013-0465-z

Cited by 24 publications

(10 citation statements)

References 33 publications

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“…In case of highest Zn loading of 10%, the reflection of (100) plane weakened considerably while reflections of peaks due to (110) and (200) planes almost completely vanished. Thus, higher Zn loading dramatically influenced the structural ordering of MCM-41 [36]. The (Fig.…”

Section: Catalyst Characterizationmentioning

confidence: 95%

Carbonylation of glycerol with urea to glycerol carbonate over supported Zn catalysts

et al. 2017

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Glycerol carbonylation with urea is a very feasible option to produce glycerol carbonate with a net result of CO 2 fixation through urea synthesis. The prerequisite of an efficient catalyst for this reaction is to possess both acid and basic sites together. Several acidic supports were screened for ZnO catalyst in this work and Zn/MCM-41 was found to exhibit the best activity and almost complete selectivity to glycerol carbonate (GC). Although, non-catalytic glycerol carbonylation resulted in GC formation but glycerol conversion achieved was twice with Zn/MCM-41 as a catalyst. Further to that increase in Zn loading from 2 to 5% resulted in increase in glycerol conversion from 63 to 82%. The prepared catalysts were characterized by XRD, NH 3 and CO 2 -TPD and effects of reaction parameters such as catalyst loading, glycerol to urea mole ratio and temperature on glycerol conversion and GC selectivity in batch mode of operation were also studied. Time on stream activity of 5% Zn/MCM-41 catalyst for continuous carbonylation of glycerol was also studied for *100 h with an average conversion of *55% and complete selectivity to GC. This indicated five times lower productivity of GC per h due to lower residence time than that in a batch operation as compared to that of a continuous operation. Activation energy estimated from the Arrhenius plot was found to be 39.82 kJ mol -1 suggesting that the reaction is kinetically controlled. A reaction pathway mediated by acid and basic sites of the Zn/MCM-41 catalyst is also proposed.

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Section: Catalyst Characterizationmentioning

confidence: 95%

Carbonylation of glycerol with urea to glycerol carbonate over supported Zn catalysts

et al. 2017

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“…The general procedure for synthesis of SBA-3 was reported [45][46][47][48]. In this work, zinc-containing SBA-3 was synthesized via an in situ approach with some modi cations [32].…”

Section: Experimental 21 Synthesismentioning

confidence: 99%

“…pH, temperature, and adsorbate concentration [39][40][41][42]. One of the appropriate methods for the preparation of such sorbent is embedding of proper metal oxides such as ZnO (active part) on silicate mesoporous materials [43][44][45][46]. Three-dimensional mesoporous materials are good candidates for this goal [47][48][49][50][51].…”

Section: Introductionmentioning

confidence: 99%

H2S Removal Using ZnO/SBA-3: New Synthesis Route and Optimization of Process Parameters

2017

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Abstract. H 2 S is a major toxic compound that could be found in air, water, and fossil fuels and causes some bad e ects such as acidic rain and corrosion. In the present work, SBA-3 (Santa Barbara University no. 3) with three di erent weight percentages of ZnO, namely, 5%, 10%, and 15%, was synthesized via an in situ approach. All synthesized samples were characterized using atomic absorption spectrometry, X-Ray Di raction (XRD), nitrogen adsorption, and Transmission Electron Microscopy (TEM). The obtained results from XRD and nitrogen adsorption con rmed that all the samples almost retained their ordered structure after incorporation of ZnO nanoparticles within the mesopores of SBA-3. TEM images showed that ZnO nanoparticles were arranged along the direction of mesopores of SBA-3. Then, adsorption of H2S from a model gas was investigated. A three-factor Box-Behnken design with ve center points and one response was performed for the evaluation of e ect of three process parameters, namely, ZnO wt%, space velocity, and temperature, on the adsorption of H 2 S and a quadratic model (r 2 : 0.9185) was developed to navigate the design space. Temperature had the largest and space velocity had the lowest e ect on the breakthrough of H 2 S. The optimum breakthrough time (t bp ) was 588 min.

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“…as the effective parameters on the arsenate removal efficiency implementing Box‐Behnken Design (BBD) and Response Surface Methodology (RSM). The application of BBD and RSM in the study of some operating parameters on the break point during H 2 S adsorption was also reported . In another statistical report, Costa et al .…”

Section: Introductionmentioning

confidence: 99%

An overall experimental analysis: Effects of synthetic parameters on the degree of order of mesochannels in nano‐sized Al‐MCM‐41

Roohollahi

Halladj

Ebrahimi

et al. 2018

Heteroatom Chemistry

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In an experimental and statistical study, the effects of five synthesis parameters on the degree of order of nano‐sized Al‐MCM‐41 were basically investigated. In a series of designed experiments, hydrothermal conditions (temperature and time), Si/Al, NaOH/Si, and cetyltrimethylammonium bromide/Si molar ratios were studied each at three levels. Degree of order of mesoporous channels was evaluated using small angle XRD. Nitrogen adsorption‐desorption technique, scanning and transmission electron microscopy (SEM‐TEM), and field‐emission SEM were also applied to detect the textural properties and the morphology of prepared nanoparticles. Energy‐dispersive X‐ray spectroscopy and mapping (EDS‐Map), inductively coupled plasma‐optical emission spectroscopy, and small angle X‐ray scattering were provided as complementary analyses. An accurate reduced quadratic equation was proposed as a function of effective terms in good agreement with the experimental results. Based on the analysis of variance, the amount of aluminum incorporated, sodium hydroxide, and the hydrothermal treatment duration was found to possess more dramatic effects on the degree of order than the other factors. The optimum conditions for the synthesis of a well‐ordered Al‐MCM‐41 were also obtained with the lowest template and the minimum hydrothermal duration verified by two validation tests.

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Removal of H2S from crude oil via stripping followed by adsorption using ZnO/MCM-41 and optimization of parameters

Cited by 24 publications

References 33 publications

Carbonylation of glycerol with urea to glycerol carbonate over supported Zn catalysts

Carbonylation of glycerol with urea to glycerol carbonate over supported Zn catalysts

H2S Removal Using ZnO/SBA-3: New Synthesis Route and Optimization of Process Parameters

An overall experimental analysis: Effects of synthetic parameters on the degree of order of mesochannels in nano‐sized Al‐MCM‐41

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