Hydrogen and syngas production from catalytic steam gasification of char derived from ion-exchangeable Na- and Ca-loaded coal

Qiu, Penghua; Du, Chunlei; Liu, Li; Chen, Lei

doi:10.1016/j.ijhydene.2018.04.055

Cited by 36 publications

(13 citation statements)

References 52 publications

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“…The carbon conversion X exp ( t ) during gasification was an important indicator for evaluating gasification reactivity. Referring to the calculation formulas in previous work, the carbon conversion X exp ( t ) formulas during CO 2 gasification were obtained as follows:…”

Section: Methodsmentioning

confidence: 99%

Study on Reactivity and Synergy Behavior of Cogasification between Biomass Char and Coal Char

et al. 2020

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The cogasification reactivity of Shenmu bituminous coal (SM) char and corn straw (CS) char in CO2 was evaluated by a fixed-bed/fluidized-bed reactor and mass spectrometry. The effects of blend ratio, gasification temperature, and CS char volatiles on the cogasification reactivity were characterized by a synergistic index. The results show that the interaction of the cogasification char with low temperature and low CS blend ratio changed from inhibition to promotion with the increasing conversion. The increase of the CS blend ratio and gasification temperature can weaken the inhibition and enhance the synergy. Furthermore, CS volatile–potassium (K) could promote the cogasification reaction, and the promotion effect increases with the rise of temperature. Finally, the cogasification reactivities of CS–SM blend char and CS char volatiles–SM char were compared. The results demonstrate that the reaction form of CS char volatiles–SM char has a better effect on improving gasification reactivity when alkali and alkaline earth metals are not melted. Otherwise, the reaction form of the CS–SM blend char performs better.

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Section: Methodsmentioning

confidence: 99%

Study on Reactivity and Synergy Behavior of Cogasification between Biomass Char and Coal Char

et al. 2020

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“…Хийжүүлэлтийн процесс нь нүүрстөрөгч агуулсан хатуу түлшнээс цахилгаан эрчим хүч, төрөл бүрийн шингэн түлш, устөрөгч болон химийн бодис үйлдвэрлэх термохимийн арга юм [1]. Хатуу түлшийг өндөр температурт, хийжүүлэгч агентаар исэлдүүлэн нийлэг хий (H 2 , CO) гарган авдаг.…”

Section: Bulletin Of the Institute Of Chemistry And Chemical Technolo...unclassified

Effect of inherent minerals on Na catalyzed gasification activity of Tavantolgoi coal

Baasanjargal

Bum-Ayush²,

Byambajav³

2021

Himi, him. tehnol. hùrèèlèngijn èrdèm šinžilgèènij bùtèèl

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Steam gasification of weathered (deposit overlay) and energy (depth of ≥300 m) coal samples of Tavantolgoi deposit situated in Tsogttsetsii soum, Umnugovi aimag were performed in this study. Relationship between coal inherent minerals and catalysts (Fe, Na, binary Fe-Na) in the gasification was investigated in a flow of Ar and steam (1:1) mixture with a rate of 200ml/min at temperature of 800°C for 1h using a fixed bed stainless reactor. Conversion of organic matter was 81.8% for the weathered coal sample, and 21.5% for the energy coal sample during non-catalytic gasification of Tavantolgoi coal. Large amount of inherent calcium minerals included in the weathered coal showed a catalytic effect on gasification activity. However, these minerals reacted actively with sodium catalysts (Na or binary Na-Fe) in stages of pyrolysis and gasification, consequently the catalysts lost their activities. Moreover, Fe ore did not have influence of catalyst in steam gasification of both weathered and energy coal samples. Moreover, an inherent Ca content of the energy coal sample was 10 times smaller than that of weathered coal sample. Gasification activity of the energy coal increased significantly with Na catalyst, and the amount of syngas increased 4.6 times compared to that evolved in noncatalytic gasification of the energy coal. Тавантолгой ордын нүүрсний натри, төмөр катализатортай хийжүүлэлтийн идэвхэд эх эрдсийн үзүүлэх нөлөө Хураангуй: Энэхүү судалгааны ажлаар Өмнөговь аймгийн Цогтцэций сумын нутагт орших Тавантолгойн ордын овоолгын исэлдсэн нүүрс болон 300 метрээс доош гүнд байрлах эрчим хүчний чулуун нүүрсний хийжүүлэлтийн идэвхэд эх эрдсүүдийн нөлөө, мөн Fe, Na болон хосолсон Fe+Na катализаторуудын үзүүлэх нөлөөг тодорхойлох туршилтыг хийж гүйцэтгэв. Тавантолгойн ордын чулуун нүүрсний уурын хийжүүлэлтийн идэвхийн туршилтыг хөдөлгөөнгүй үет ган реакторт, 800ºС температурт, 200 мл/мин урсгал хурдтай аргон хий ба усны уурын 1:1 молийн харьцаа бүхий хийн холимогоор 1 цагийн турш хийжүүлсэн. Катализаторгүй үед Тавантолгойн исэлдсэн нүүрсний органик массын хувирал нь 81.8%, эрчим хүчний нүүрснийх 21.5% байв. Исэлдсэн нүүрсэнд агуулагдах кальци эрдэс нь нүүрсний уурын хийжүүлэлтийн идэвхийг нэмэгдүүлж байсан. Fe катализатор нь Тавантолгойн нүүрсний органик массын хувирлыг 0.32-1.81%-иар л нэмэгдүүлсэн, дан Na ба Fe+Na хосолсон катализатор нь органик массын хувирлыг 18.5-74.3% эрс нэмэгдүүлсэн. Тавантолгойн исэлдсэн нүүрсэнд катализатор хэрэглэх үед нүүрсэнд агуулагдах кальци нь катализатортай урвалд орж хийжүүлэлтийн идэвхэд мэдэгдэхүйц нөлөө үзүүлээгүй. Харин эрдсийн агуулга багатай эрчим хүчний нүүрсэнд кальци нь 10 дахин бага байсан. Эрчим хүчний нүүрсэнд Na катализаторыг хэрэглэх үед эх төмөр эрдэстэй хам идэвхжүүлэлтийн нөлөөгөөр хийжүүлэлтийн урвалын хурдыг эрс нэмэгдүүлсэн.Түлхүүр үг: Нүүрсний эрдэс, уурын хийжүүлэлт, төмрийн хүдэр, натрийн карбонат катализатор.

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“…Steam gasification is prone to the formation of tar, which may affect the maintenance and operation cost due to pipeline blockage. 57 Therefore, catalysts are often used to promote tar cracking and reduce the operating temperature as well as increase the hydrogen selectivity from biomass. 58 Some of the common catalysts are alkaline earth catalysts (e.g., KOH, KHCO 3 , Na 3 PO 4 , MgO, and NaOH), 26 , 59 metal-based catalysts (e.g., Ni/Al 2 O 3 .…”

Section: Technologies For Renewable Hydrogen Productionmentioning

confidence: 99%

Renewable hydrogen for the chemical industry

Rambhujun

Salman

Wang

et al. 2020

MRS Energy & Sustainability

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Hydrogen and syngas production from catalytic steam gasification of char derived from ion-exchangeable Na- and Ca-loaded coal

Cited by 36 publications

References 52 publications

Study on Reactivity and Synergy Behavior of Cogasification between Biomass Char and Coal Char

Study on Reactivity and Synergy Behavior of Cogasification between Biomass Char and Coal Char

Effect of inherent minerals on Na catalyzed gasification activity of Tavantolgoi coal

Renewable hydrogen for the chemical industry

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