Determination of SBA-15 acidity through n-butyl amine TPD: a theoretical and experimental study

Luz, Geraldo E.; Lima, Francisco das Chagas Alves; Neto, Cicero O. Costa; Paz, Gizeuda L.; Silva, Edjane F. B.; Barbosa, Marcela Nascimento

doi:10.1007/s10853-013-7492-5

Cited by 6 publications

(3 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Acidity is one of the most important character for the catalysts (Lercher, Gründling, & Eder-Mirth, 1996). N-butyl amine titration method was employed for determining the acidity of catalysts (Luz et al, 2013). As shown in Table 1, the niobic acid coating with sulfuric acid, its acidity was −14.52 of hammette acidity, when the other mineral acids coating with niobic acid, their hammett acidity were −12.44, −13.16 and −12.70.…”

Section: Preparation and Characterization Of Niobic Acidsmentioning

confidence: 99%

Coating of Mineral Acids with Niobic Solid Acid for Preparing Furfural from Nut Shell of <i>Camellia oleifera</i> Abel

Hu¹,

Du²,

Zhang³

2016

OJF

View full text Add to dashboard Cite

Nut shell of Camellia oleifera Abel which has large scale of plantation in mountainous region of southern China is abundant renewable resource. The nut shell is suitable for preparation of furfural, as the content of which is as much as 16% (based the dried nut shell). In early time, mineral acids were employed as typically catalyst for preparing of furfural from the nut shells. These mineral acids could pollute water and corrode equipment. In this paper we used various mineral acids coating with niobic acid as catalysts to investigate reactions for preparation of furfural. Among these catalysts, the catalyst of sulfuric acid coating with niobic acid was found to be very effective, which had higher hammett acidity and better effect of hydrolysis of the nut shells; The catalysts of sulfuric acid coating with niobic acid was characterized, and the conditions of preparation of the catalyst were investigated. The optimum conditions were: sulfuric acid as coating acid, the concentration of sulfuric 1.1 mol/L, impregnation time 8 h, calcination time 8 h and calcination temperature 450˚C. Then hydrolysis of the nut shells was explored, the optimum conditions were as follows: dose of catalyst 20%, ratio of solid to liquid 1:15, reaction temperature 100˚C, reaction time 4 h; Under this condition, the yield of furfural was 8.7%.

show abstract

Section: Preparation and Characterization Of Niobic Acidsmentioning

confidence: 99%

Coating of Mineral Acids with Niobic Solid Acid for Preparing Furfural from Nut Shell of <i>Camellia oleifera</i> Abel

Hu¹,

Du²,

Zhang³

2016

OJF

View full text Add to dashboard Cite

show abstract

“…The most frequently used way to obtain this is by incorporation of aluminum atoms in their structures, while gallium and specific transition metals such as Ti and Fe may also be used. The type (nature) of the element incorporated, as well as its content (Si/metal atomic ratio), allow to estimate the acid site distribution as number and strength of Brönsted and Lewis sites [17][18][19]. This modified mesoporous material is particularly important for catalytic applications, and the substitution of Si allows an alteration of the acidity and/or redox properties.…”

Section: Introductionmentioning

confidence: 99%

Ga-SBA-3 A novel nanostructured material: synthesis, characterization and application

2018

View full text Add to dashboard Cite

This paper reports for the first time the incorporation of gallium into the structure of the mesoporous SBA-3 material in order to modify the intrinsic acidity of the material. The study indicates the effective incorporation of Ga into a network in tetrahedral form, with most in the interior of the lodging and a low proportion on the external surface. Gallium was introduced via post-synthesis using Ga-nitrate in appropriate conditions. The nanostructured material was characterized by ICP, x-ray diffraction, nuclear magnetic resonance-MAS, x-ray photoelectron spectra, FTIR, SEM, transmission electron microscopy and UV–vis. Pyridine was used as a probe molecule for the determination of its acidity following the amount and type of acidic sites by FTIR. In addition, aniline adsorption/desorption studies and subsequent in situ polymerization, polyaniline (PANI)/Ga-SBA-3, were carried out with the aim of producing a nanocomposite with conductive properties. The original material had good structural regularity and acidity of Brønsted and Lewis; the PANI/Ga-SBA-3 composite also showed a conductivity of 2.5 × 10−3 S cm−1, higher than that of its homologs Al-SBA-3 and Al-MCM- 41.

show abstract

“…In Fig. 4(a), three diffraction peaks indexed as the (100), (110) and (200) could be ascribed to the intrinsic characteristic of mesostructure of SBA-15 with two-dimensional hexagonal P6mm symmetry [31] . The 2θ value of (100) peak of respectively.…”

mentioning

confidence: 99%

Silicon dioxide molecular sieve with mono-layer carbon deposited in the channels and carbon nanotubes on the outside for lithium–sulfur batteries

Jia

Zhu

et al. 2016

RSC Adv.

View full text Add to dashboard Cite

show abstract

Determination of SBA-15 acidity through n-butyl amine TPD: a theoretical and experimental study

Cited by 6 publications

References 27 publications

Coating of Mineral Acids with Niobic Solid Acid for Preparing Furfural from Nut Shell of <i>Camellia oleifera</i> Abel

Coating of Mineral Acids with Niobic Solid Acid for Preparing Furfural from Nut Shell of <i>Camellia oleifera</i> Abel

Ga-SBA-3 A novel nanostructured material: synthesis, characterization and application

Silicon dioxide molecular sieve with mono-layer carbon deposited in the channels and carbon nanotubes on the outside for lithium–sulfur batteries

Contact Info

Product

Resources

About

Determination of SBA-15 acidity through n-butyl amine TPD: a theoretical and experimental study

Cited by 6 publications

References 27 publications

Coating of Mineral Acids with Niobic Solid Acid for Preparing Furfural from Nut Shell of &lt;i&gt;Camellia oleifera&lt;/i&gt; Abel

Coating of Mineral Acids with Niobic Solid Acid for Preparing Furfural from Nut Shell of &lt;i&gt;Camellia oleifera&lt;/i&gt; Abel

Ga-SBA-3 A novel nanostructured material: synthesis, characterization and application

Silicon dioxide molecular sieve with mono-layer carbon deposited in the channels and carbon nanotubes on the outside for lithium–sulfur batteries

Contact Info

Product

Resources

About

Coating of Mineral Acids with Niobic Solid Acid for Preparing Furfural from Nut Shell of <i>Camellia oleifera</i> Abel

Coating of Mineral Acids with Niobic Solid Acid for Preparing Furfural from Nut Shell of <i>Camellia oleifera</i> Abel