Sulfuric acid improves the reactivity of zeolites via dealumination

Chen, X.; Srubar, Wil V.

doi:10.1016/j.conbuildmat.2020.120648

Cited by 17 publications

(8 citation statements)

References 53 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Meanwhile, the SO 2 + H 2 O + O 2 ‐TPD experiment shows that the SO 2 desorption curve have three sub‐peaks at ~601, 656, and 745°C attributed to the decomposition of Fe 2 (SO 4 ) 3 , CuSO 4 , and Al 2 (SO 4 ) 3 , respectively (Figure 7D). 17,59,60 By comparing the sulfate species formed in the SO 2 + O 2 ‐TPD and SO 2 + H 2 O + O 2 ‐TPD experiments, it is seen that over the fresh catalyst H 2 SO 4 appears and the zeolite framework is dealuminated after introducing H 2 O, in accordance to the previous report that sulfuric acid could induce the dealumination of aluminosilicate frameworks 61 …”

Section: Resultssupporting

confidence: 85%

Insight into the SO₂ poisoning of heterobimetallic FeCu‐SSZ‐13 zeolite in NH₃‐SCR reaction

Lin,

Wang,

et al. 2023

AIChE Journal

View full text Add to dashboard Cite

The SO2 poisoning of a heterobimetallic FeCu‐SSZ‐13 in selective catalytic reduction of NO with NH3 (NH3‐SCR) was systematically investigated in this study. It was shown that when SO2 is involved in the feeding flue gas, the losses in the redox ability of active metals (primary contributor to deactivation) and in the number of Brønsted acid sites both inhibit the formation of NH4NO2 intermediate, resulting in the rapid deactivation of FeCu‐SSZ‐13. The SO2 poisoning of FeCu‐SSZ‐13 at low temperature is more serious than at high temperature, because of the more severe loss of redox ability of active metals. Unlike that of monometallic Cu‐/Fe‐CHA, the SO2 poisoning of the bimetallic one is saliently featured by that partial SO2 is oxidized to SO3 and partial Brønsted acid sites are destroyed due to the formation of H2SO4. This work may provide a fundamental understanding on the SO2 poisoning of heterobimetallic zeolite‐based NH3‐SCR catalysts.

show abstract

Section: Resultssupporting

confidence: 85%

Insight into the SO₂ poisoning of heterobimetallic FeCu‐SSZ‐13 zeolite in NH₃‐SCR reaction

Lin,

Wang,

et al. 2023

AIChE Journal

View full text Add to dashboard Cite

show abstract

“…The algae were first intermixed with cement particles before mixing with water. Cement, algae, and water were then mixed with a Caframo Ultra Speed BDC6015 overhead stirrer at 140 rpm for 30 s and subsequently mixed at 285 rpm for 2.5 min: the same mixing protocol that was adopted and reported in an earlier study . In between the two speeds of the mixing procedure, materials on the edges of the mixing cup were scraped.…”

Section: Materials and Experimental Methodsmentioning

confidence: 99%

“…Cement, algae, and water were then mixed with a Caframo Ultra Speed BDC6015 overhead stirrer at 140 rpm for 30 s and subsequently mixed at 285 rpm for 2.5 min: the same mixing protocol that was adopted and reported in an earlier study. 28 In between the two speeds of the mixing procedure, materials on the edges of the mixing cup were scraped. Immediately following mixing, the cement pastes were cured at ambient conditions (approximately 30% humidity and 20 °C temperature) for 2 days and then in a sealed condition at ∼20 °C until further testing/processing at 28 days of curing.…”

Section: Materials and Experimental Methodsmentioning

confidence: 99%

Retardation of Portland Cement Hydration with Photosynthetic Algal Biomass

Chen

Matar

Beatty

et al. 2021

ACS Sustainable Chem. Eng.

Self Cite

View full text Add to dashboard Cite

In this work, the effects of raw algal biomass on the hydration kinetics of portland cement are reported. Specifically, direct addition of 0.3%, 0.5%, 1.0%, and 3.0% photosynthetic Chlorella algal biomass to cement paste substantially delayed cement hydration, as indicated by 16.5%, 29.4%, 82.4%, and 812% delays in the main peak of heat evolution measured by isothermal calorimetry. Retardation was confirmed via FTIR to be mechanistically caused by the existence of −COOH and −OH functional groups in raw algae. We substantiated the observation that elimination of −COOH and −OH functional groups in the algae through heat treatment coincided with the disappearance in the retardation effect, while enhancement of these functional groups through H 2 O 2 treatment induced further retardation. In addition, the effects of untreated and treated algae on the morphology, mineralogy, and compressive strength of cement pastes containing 0.5% Chlorella were found to be negligible. An addition of 0.5% algal biomass is estimated to cost approximately USD $1.6−2.6/m 3 of concrete, suggesting that raw algae could be used as a renewable, cost-competitive, CO 2 -storing set-retarding admixture for portland cement-based materials.

show abstract

“…These intermixed powders were then mixed with water at a water-to-cement ratio (w/c) of 0.40 using a Caframo Ultra Speed BDC6015 overhead stirrer. In accordance with a previously published protocol, 35 the samples were mixed at 140 rpm for 30 s and then at 285 rpm for 2.5 min. The edges of the mixing cup were thoroughly scraped between the two mixing speeds.…”

Section: Morphological and Chemicalmentioning

confidence: 99%

Algal Biochar-Metal Nanocomposite Particles Tailor the Hydration Kinetics and Compressive Strength of Portland Cement Paste

Chen,

Beatty,

Matar

et al. 2024

ACS Sustainable Chem. Eng.

Self Cite

View full text Add to dashboard Cite

Biochar can improve the mechanical properties of portland cement paste and concrete. In this work, we produced algal biochar-zinc (biochar-Zn) and algal biochar-calcium (biochar-Ca) nanocomposite particles and studied their effect on the hydration kinetics and compressive strength of cement paste. Results show that 3 wt % biochar-Zn delayed peak heat evolution during cement hydration from 8.3 to 10.0 h, while 3 wt % addition of biochar-Ca induced a minor acceleration of peak heat from 8.3 to 8.2 h. Both biochar-Zn and biochar-Ca nanocomposite particles increased the compressive strength of cement paste at 28 days by 22.6 and 17.0%, respectively. Data substantiate that retardation or minor acceleration of the reaction kinetics was due exclusively to the presence of Zn and Ca phases, respectively, while the enhanced strength was attributed to a nucleation effect induced by such phases and the internal curing effect of biochar.

show abstract

Sulfuric acid improves the reactivity of zeolites via dealumination

Cited by 17 publications

References 53 publications

Insight into the SO₂ poisoning of heterobimetallic FeCu‐SSZ‐13 zeolite in NH₃‐SCR reaction

Insight into the SO₂ poisoning of heterobimetallic FeCu‐SSZ‐13 zeolite in NH₃‐SCR reaction

Retardation of Portland Cement Hydration with Photosynthetic Algal Biomass

Algal Biochar-Metal Nanocomposite Particles Tailor the Hydration Kinetics and Compressive Strength of Portland Cement Paste

Contact Info

Product

Resources

About

Sulfuric acid improves the reactivity of zeolites via dealumination

Cited by 17 publications

References 53 publications

Insight into the SO2 poisoning of heterobimetallic FeCu‐SSZ‐13 zeolite in NH3‐SCR reaction

Insight into the SO2 poisoning of heterobimetallic FeCu‐SSZ‐13 zeolite in NH3‐SCR reaction

Retardation of Portland Cement Hydration with Photosynthetic Algal Biomass

Algal Biochar-Metal Nanocomposite Particles Tailor the Hydration Kinetics and Compressive Strength of Portland Cement Paste

Contact Info

Product

Resources

About

Insight into the SO₂ poisoning of heterobimetallic FeCu‐SSZ‐13 zeolite in NH₃‐SCR reaction

Insight into the SO₂ poisoning of heterobimetallic FeCu‐SSZ‐13 zeolite in NH₃‐SCR reaction