Sorption of CO2 in Shales Using the Manometric Set-up

Abstract

In a transition period from a fossil fuel based society to a sustainable energy society it is expected that CO 2 capture and subsequent sequestration (CCS) in geological formations will play a major role in reducing greenhouse gas emissions. Possibilities of sequestration include storage in aquifers and depleted gas reservoir. The storage capacity of gas reservoirs for CO 2 depends also on the sorption in the omnipresent minerals and shales. It is important to investigate whether adsorption on shales gives an important contribution to the storage capacity. It is also important to relate the adsorption to the carbon content in the shale. Only a few measurements have been reported in the literature for high-pressure gas sorption on shales, and interest is largely focused on shales occurring outside Europe. We present results using a high pressure manometric setup on a dried black shale sample from Belgium. It consists of more than 57% of clay minerals and 6.58% organic matter. The excess sorption isotherm shows an initial increase to a maximum value of 0.19 mmol/gram and then starts to decrease until it becomes zero at 82 bar and subsequently the excess sorption becomes negative. Similar behavior was also observed for other shales and coal reported in the literature. We derive the equation for excess sorption in the manometric set-up allowing for a changing void volume. This equation is based on the finite density of the adsorbed phase. However, this is not the only mechanism causing a maximum in the sorption curve. Other reasons for void volume change are swelling of the shale and volume changes due to chemical reactions excluding sorption. Further research is necessary to investigate reasons for void volume changes in shales.

Mechanisms for CO2 Sequestration in Geological Formations and Enhanced Gas Recovery

“…This compares very favorably with the annual Dutch emission of 0.17 Gton/year and would allow for several decades of the Dutch yearly CO2 emissions to be stored [69]. This indicates the potential importance of CO 2 storage in geological formations, and many studies have been undertaken on this topic .…”

“…To illustrate the importance of shale formations for CO 2 storage, we can refer to work done concerning the Netherlands. The Dutch resource of shale gas is estimated between 48,000 and 230,000 Bcm and if one assumes that technology can be developed to store 1 m 3 of CO 2 for 1m 3 of CH 4 produced and that only one percent of the resource can be recovered, a substantial 480-2,300 Bcm of CO 2 , corresponding to 0.9 to 4.35 Gton CO 2 , could be stored [69].…”

Reducing the anthropogenic impact on the environment as part of the transition to environmentally friendly energy sources: a review of current research on hydrogen synthesis and carbon dioxide utilization

“…Однако быстрый отказ от нефти, природного газа и угля вряд ли будет возможен без серьезного нарушения мировой экономики. Предполагается, что в переходный период от общества, основанного на ископаемом топливе, к обществу «устойчивой энергетики» улавливание CO2 и последующее связывание в геологических формациях (CCS) могут сыграть важную роль в сокращении выбросов парниковых газов [4]. Однако для современных технологий связывание диоксида углерода по-прежнему требует больших энергетических затрат из-за сложности некоторых технологических операций [5].…”

Analysis of mathematical modeling methods in the processes of underground injection, storage, and conversion of carbon dioxide

“…5 In a transition period from a fossil fuel-based society to a sustainable energy society, it is predicted that CO 2 capture and subsequent storage (CCS) in geological formations can be developed to play a role in reducing greenhouse gas emissions. 6 However, for current state of the technology, carbon dioxide sequestration is still energetically demanding due to high separation costs. 7 In this regard, developments in the field of alternative energy sources are becoming increasingly relevant: solar energy and hydrogen energy.…”

“…The growing concern about global warming has increased interest in geological storage of carbon dioxide (CO 2 ) 5 . In a transition period from a fossil fuel‐based society to a sustainable energy society, it is predicted that CO 2 capture and subsequent storage (CCS) in geological formations can be developed to play a role in reducing greenhouse gas emissions 6 …”