Synthesis of micro- and mesoporous ZSM-5 composites and their catalytic application in glycerol dehydration to acrolein

Zhou, Chen; Zhang, Wengui; Zhai, He-Sheng; Huang, Caijuan; Chao, Zi‐Sheng

doi:10.1016/s0167-2991(07)80376-4

Cited by 26 publications

(6 citation statements)

References 8 publications

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“…[56] The best result achieved with these catalysts was 73.6 % acrolein selectivity at 98.3 % glycerol conversion, which is a good performance. Rare-earth pyrophosphates were also claimed by Liu and co-workers to be efficient catalysts for the production of acrolein by vapor-phase dehydration of glycerol [57] with an acrolein yield as high as 80 % achieved over Nd 4 A C H T U N G T R E N N U N G (P 2 O 7 ) 3 .…”

Section: Recent Progress: Other Classes Of Active Catalystsmentioning

confidence: 85%

Towards the Sustainable Production of Acrolein by Glycerol Dehydration

et al. 2009

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The massive increase in biodiesel production by transesterification of vegatable oils goes hand-in-hand with the availability of a large volume of glycerol, which must be valorized. Glycerol dehydration to acrolein over acid catalysts is one of the most promising ways of valorization, because this compound is an important chemical intermediate used in, for example, the DL-methionine synthesis. In this Minireview, we give a detailed critical view of the state-of-the-art of this dehydration reaction. The processes developed in both the liquid and the gas phases are detailed and the best catalytic results obtained so far are reported as a benchmark for future developments. The advances on the understanding of the reaction mechanism are also discussed and we further focus particularly on the main obstacles for an immediate industrial application of this technology, namely catalyst coking and crude glycerol direct-use issues.

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Section: Recent Progress: Other Classes Of Active Catalystsmentioning

confidence: 85%

Towards the Sustainable Production of Acrolein by Glycerol Dehydration

et al. 2009

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“…The reaction conditions are as follows: temperature, 425 °C; LHSV, 0.60 h –1 ; glycerol concentration, 36 wt %; molar ratio glycerol/ammonia, 1/4; and TOS, 1–3 h. It is known that glycerol can be dehydrated into acrolein and acetol as primary products, according the reactions as follows: , In addition, various pyridine bases can be formed via the reactions as follows: ,,− , From Table , one can see that various pyridine bases are generated over all the catalysts, and the total yield of pyridine bases has the order pyridine > 3-picoline > 2- and 4-picolines. The generation of 3-picoline can be caused by the first dehydration of glycerol into acrolein (eq ), being in fact the main product over ZSM-5 zeolite catalysts, − and then the reaction of acrolein and ammonia (eq ). The generation of 2- and 4-picolines involves acetaldehyde as a raw material, according to eq .…”

Section: Resultsmentioning

confidence: 99%

“…Biomass, as an efficient substitute for traditional fossil fuel resources (coal, oil, and natural gas), is cheap, abundant, renewable, and environmentally friendly, and its application in the production of useful chemicals is of extremely great interest. − A representative biomassed compound is glycerol, which is currently manufactured on a large scale as the byproduct of biodiesel process. In recent years, the output of glycerol has exceeded greatly its consumptive market capacity; in fact, the overstock of glycerol has also caused a bottleneck, greatly hindering the further development of the biodiesel industry. − Therefore, the efficient utilization of glycerol is receiving more and more attention from both academic and industrial researchers.…”

Section: Introductionmentioning

confidence: 99%

“…In recent years, the output of glycerol has exceeded greatly its consumptive market capacity; in fact, the overstock of glycerol has also caused a bottleneck, greatly hindering the further development of the biodiesel industry. − Therefore, the efficient utilization of glycerol is receiving more and more attention from both academic and industrial researchers. It was reported that glycerol could be catalytically dehydrated into acrolein at considerably high yields, − in addition to its conversion to many other valuable chemicals. − Furthermore, acrolein could react with ammonia to generate pyridine bases at an appreciably high yield of pyridine bases . The most important aspect associated with this route may consist in that an obviously higher selectivity to 3-pyridine can be achieved, but without the formation of 4-picoline, relative to the reaction of acetaldehyde/formaldehyde and ammonia.…”

Section: Introductionmentioning

confidence: 99%

“…ZSM-5 zeolite-based catalysts were the most frequently studied catalysts for not only the dehydration of glycerol to acrolein − but also the generation of pyridine bases from various raw materials. ,,− This can be attributed to the advantages associated with ZSM-5 zeolite, such as unique shape selectivity, excellent hydrothermal stability, and adjustable acid performance. Nevertheless, the relatively fast deactivation of ZSM-5 zeolite-based catalysts due to carbon deposition during the above reactions is still a great challenge.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Influence of Reaction Parameters on the Catalytic Performance of Alkaline-Treated Zeolites in the Novel Synthesis of Pyridine Bases from Glycerol and Ammonia

Luo

Huang

Liu

et al. 2016

Ind. Eng. Chem. Res.

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This work presented a novel route for the synthesis of pyridine bases from glycerol and ammonia. The whole process consisted of the dehydration of glycerol to acrolein and the subsequent condensation of acrolein and ammonia to pyridine bases, with the two reactions being conducted either simultaneously over a single catalyst in a conventional fixed-bed reactor (single-stage reactor mode) or separately over two different catalysts, namely, a catalyst pair, in a series-connected fixed-bed reactor (two-stage reactor mode). Under the optimized conditions, a 32.18% total yield of pyridine bases was achieved over the HZSM-5-At-acid catalyst, while a 62.25% and 60.85% total yield of pyridine bases, without the formation of 4-picoline, could be afforded over the catalyst pairs (HZSM-5-At + ZnO/HZSM-5-At-acid) and (HZSM-22-At-acid + ZnO/HZSM-5-At-acid), respectively. The catalyst pair (HZSM-22-At-acid + ZnO/HZSM-5-At-acid) exhibited the greatest stability with time-on-stream. This was attributed to the fact that the above-mentioned two reactions were affected differently by the texture and acid properties of the catalyst, and they could be simultaneously promoted to the greatest extent over two different suitable catalysts in a two-stage reactor mode but not over a single catalyst in the single-stage reactor mode. This novel route was shown to be more green and efficient relative to those employed currently in both industrial production and the literature.

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