Effect of ceria and zirconia promotors on Ni/SBA-15 catalysts for coking and sintering resistant steam reforming of propylene glycol in microreactors

Shanmugam, Vetrivel; Zapf, Ralf; Neuberg, Stefan; Hessel, Volker; Kolb, Gunther

doi:10.1016/j.apcatb.2016.10.075

Cited by 94 publications

(28 citation statements)

References 61 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The opposite is true for the Ni/Zr catalyst, were agglomeration of Ni particles deposited on Zr is notably affecting its estimated Ni 0 dispersion value. This is in accordance with the literature, as it has been reported that the presence of SiO2 in the support can restrict the sintering of the Ni particles [69,70]. It has also been reported that zirconia enhances the resistance of silica to steam significantly and increases the interaction between nickel and the support, and furthermore, prevents the growth of nickel oxide species during the calcination process through the formation of a ZrO2-SiO2 composite structure [71].…”

Section: Physicochemical Structural and Textural Properties Of Catalsupporting

confidence: 92%

The influence of SiO2 doping on the Ni/ZrO2 supported catalyst for hydrogen production through the glycerol steam reforming reaction

et al. 2019

View full text Add to dashboard Cite

Highlights  SiO2 stabilizes monoclinic ZrO2, restricts sintering, strengthens Ni-support interaction  Ni/SiZr reveals increased H2 yield (close to thermodynamic) and CO2 selectivity  High H2/CO ratio and a negligible CO/CO2 can be achieved by the Ni/SiZr  At 750 o C acetone, acetaldehyde main products for Ni/Zr and allyl alcohol for Ni/SiZr  Ni/SiZr (half of carbon) more resistant to deactivation in comparison with the Ni/Zr

show abstract

Section: Physicochemical Structural and Textural Properties Of Catalsupporting

confidence: 92%

The influence of SiO2 doping on the Ni/ZrO2 supported catalyst for hydrogen production through the glycerol steam reforming reaction

et al. 2019

View full text Add to dashboard Cite

show abstract

“…Various promoters, such as CeO 2 , ZrO 2 and CeO 2 -ZrO 2 were added to enhance the activity of Ni/SBA-15 catalyst in propylene glycol reforming 217. The incorporation of CeO 2 and ZrO 2 effectively controlled the size of Ni particles.…”

mentioning

confidence: 99%

Advances in porous and nanoscale catalysts for viable biomass conversion

et al. 2019

View full text Add to dashboard Cite

show abstract

“…Como se observa, este carbono é diferente daquele do SBA, posto que queima a uma maior temperatura e tem um pico mais estreito, o que mostra que sua estrutura é mais regular que no caso do outro catalisador. Este depósito de coque refere-se a carbono grafítico, que tem uma estrutura mais organizada e densa que os nanotubos e nanofibras de carbono, derivada da polimerização de ligações C-C de pares de carbono sp 2 dos intermediários das reações da HDO (SHANMUGAN et al, 2017). O carbono grafítico tem um empacotamento maior que outras espécies, o que o torna mais nocivo ao catalisador, uma vez que provoca a desativação por recobrir os sítios com uma camada estável e irreversível de matéria que impede a adsorção dos reagentes e sua conversão (ECHEANDIA et al, 2014;LEE et al, 2004;SHANMUGAN et al, 2017).…”

Section: Dessorção De Amônia a Temperatura Programada (Tpd-nh 3 )unclassified

“…como matrizes grafíticas desordenadas e estruturas de carbono com defeitos (MARTINS et al, 2017). Por outro lado, a 1589 cm -1 , encontra-se a banda G do carbono (grafite), correspondente a carbono de estrutura mais organizada, como grafite, grafeno, nanotubos e carbono filamentoso (SHANMUGAN et al, 2017). Além dessas duas bandas, em 1265 cm -1 , encontra-se a banda D4 e, em 1485 cm -1 e 1552 cm -1 , a banda D3 que correspondem às matrizes grafíticas desordenadas e carbono amorfo, respectivamente (KOUKETSU et al, 2014;MARTINS et al, 2017 Este ombro corresponde, provavelmente, à agua adsorvida mais fortemente na superfície dos poros da sílica e que tem que vencer as forças capilares da estrutura para evaporar (GIL et al, 2015;OCCELLI;BIZ;AUROUX, 1999;PAUL et al, 2016 ;ZHAO et al, 1998 gcat -1 h -1 ) > HZSM-5 (1,25 mgcoque gcat -1 h -1 ) > HY (0,9 mgcoque gcat -1 h -1 ) > ZrO2 (0,8 mgcoque gcat -1 h -1 ).…”

Section: Espectroscopia Ramanunclassified

Hidrodesoxigenação de bio-óleos utilizando catalisadores de níquel e molibdênio suportados em sílica mesoporosa SBA-15.

Lima¹

View full text Add to dashboard Cite

A key disadvantage of the bio-oils precursors of biodiesel is the high load of oxygenated compounds that reduce their heat of combustion, dropping their efficiency and making them unfeasible on a large scale. In light of that, the hydrodeoxygenation process (HDO) is relevant, since it eliminates these compounds through a catalytic reaction, thus increasing the calorific value of the fuel. In this work, the HDO of guaiacol (2-methoxyphenol) as a model compound of the bio-oils derived from biomass was studied and the performance of Ni-Mo catalysts was evaluated. A catalyst supported on SBA-15-a high surface area mesoporous silica material-was compared to a traditional gamma-alumina-supported catalyst. For this purpose, a continuous gas phase setup with fixed bed reactor was employed. The catalysts properties were identified by N2 adsorption, SEM, TEM, XRD, H2-TPR, FTIR, O2-TPO, Raman and TGA techniques. Through XRD and TEM, it was verified that smaller and more dispersed NiO and MoO3 particles were formed in the case of the SBA-15 catalyst, due to the lower interaction with the support and the greater surface area, which resulted in a degree of reduction of 91.6% for this catalyst, as opposed to 73.4% for the other one, both analyzed by H2-TPR. The catalytic tests showed that the NiMo/SBA-15 outperforms the alumina catalyst in terms of conversion in the range of 200 to 300 °C, with cyclohexene and cyclohexane as main products, in contrast with major selectivity to catechol and phenol on NiMo/γ-Al2O3. At 300 °C, the silica-supported catalyst achieved rates of 66.5% for HDO and 35.3% for HDA (hydrodearomatization), whereas alumina reached only 30.8 and 2.7%, respectively. Finally, it was shown that the SBA-15 catalyst had a coke deactivation rate of 1.14 mgcoke gcat-1 h-1 , 31% lower than the alumina catalyst, whose coke deposits consisted of well-structured irreversible graphitic carbon. In view of the results, this dissertation proposes the routes and reaction mechanisms of guaiacol on the studied catalysts, knowledge that is pertinent for the development and improvement of future HDO catalysts.

show abstract

Effect of ceria and zirconia promotors on Ni/SBA-15 catalysts for coking and sintering resistant steam reforming of propylene glycol in microreactors

Cited by 94 publications

References 61 publications

The influence of SiO2 doping on the Ni/ZrO2 supported catalyst for hydrogen production through the glycerol steam reforming reaction

The influence of SiO2 doping on the Ni/ZrO2 supported catalyst for hydrogen production through the glycerol steam reforming reaction

Advances in porous and nanoscale catalysts for viable biomass conversion

Hidrodesoxigenação de bio-óleos utilizando catalisadores de níquel e molibdênio suportados em sílica mesoporosa SBA-15.

Contact Info

Product

Resources

About